When the Screaming Stops (1974) Amando de Ossorio

The legendary Loreley has been living for centuries in a grotto beneath the river Rhein in Germany. Every night when the moon is full, she turns into a reptile-like creature craving for human blood. When one girl after another of a nearby boarding school is killed by her, a hunter named Sirgurd is engaged to kill the monster. 

A series of nasty and bloody murders in which young and sexy women are found with their hearts torn out are connected to a horrible mythological creature known as the Loreley, who lives under water. Eurohorror goddess Helga Line plays Loreley and she transforms from beautiful woman to an ugly creature with an urge to kill. Only local hunter Tony Kendall can stop her reign of terror. "The Loreley's Grasp" by Amando "Blind Dead" de Ossorio is a fantastic slice of Euro-exploitation. It's loaded with beautiful Euro babes and nasty heart-ripping sequences. The atmosphere of horror is well-developed and the acting is fairly good. The film is quite tame when it comes to erotica. The monster makeup tends to look terrible. Still the film works as a charming mood piece.